Selecting-switch.



F. A. LUNDQUlST. SELECTINGVSWITCH. APPLICATION FILED AUG.2. me.

1 ,283,83 1 Patented Nov. 5, 1918.

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' Affy F. A. LUNDQUIST.

SELECTING SWITCH.

APPLICATION FILED Aus.2. 1916.

1 283,83 1 Patented Nov. 5, 1918.

2 SHEETS-SHEET 2- Frank A. Lundqu/sf.

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gitudinal movement.

UNITED STATES PATENT OFFICE.

FRANK A. LUNDQUIST, OF NEW'YORK, N. Y., ASSIGNORTO-W ESTERN ELECTRIC COM- PANY, INCORPORATED, OF'NEW YORK, N. 'Y., .A CORPORATION OF NEW YORK.

SELECTING-SWITCH.

Application fi1ed August 2, 1916.

clear, concise, and exact description.

The present invention relates to improvements in selecting switches of that type in which the active contacts or brushes are placed in'engagement with the desired assive contact of the switch by a longitudinal and rotary movement of the brush carrying element.

The main feature of the present invention is the provision of a single operating magnet to control both the rotary and longitudinal movements of the brush carrying'element, and a slow-releasing magnet to control the sequence of these movements.

Referring to the drawings, Figure 1 shows a side elevation of the skeleton structure of theimproved switch, the frame structure and unnecessary parts having been omitted for clearness in illustration; Fig. 2 represents a similar view of 'a modified form of the invention; and 'Fig. 3 illustrates a, sectional view taken on the line 22 of the structure shown in F ig. 2.

Referring toFig. 1, 5 represents a brush carrying shaft mounted for rotary and lon- This shaft carries brushes 6, which engage the contacts 7 of a switch bankshown in section at 8. The shaft also carries a rotary ratchet 9 which is driven by a pawl 15 on L-shaped lever 10, which carries armature 10 of the motor magnet 11. This L-shaped lever is pivoted at 12 and is held in retracted position by a spring 13. The vertical arm of the lever is provided with a right angular extension 14, which carries therotary pawl 15. This vertical arm has its freeend bifurcated for-a purpose which will be herein later described. The rotary pawl 15 rides on a bearing member 16, so that this pawl in its normal position is out of engagement with the teeth of the rotary ratchet. A holding dog 17 is'pivoted at 18 and actuated by a spring 19, so that when the holding dog is free to operate it engages the rotary ratchet teeth. 20 designates an elongated holding member which engages the teeth of the rotary ratchet as soonas the shaft has taken a vertical step.

Specification of Letters Patent.

Patented Nov. 5, 1918.

Serial No. 112,757.

This member, in the elevated position of the shaft, prevents the rotation of the shaft back to its normal position. 21 indicates a slowreleasing magnet whose armature 22 is pivoted'at 23 and held retracted by spring 2i. To the free end of this arm there is pivoted a holding pawl 25, which is held out of engagement with vertical ratchet teeth 26 of the shaft by spring 27. This pawl is provided with a resilient arm 57, the purpose of which will be herein later described. A link 28 is attached to the armature 22 and passes through an aperture in the holding dog 17 This link, in the retracted position of armature 22, prevents the holding dog 17 from engaging the rotary ratchet. A spring 29, which has one of its ends attached to a casing 30, carried by the frame, and its other end attached to a collar having a projection which rides in a longitudinal slot 31 in the brushshaft 5, provides for the return of the shaft to its normal rotary position. This spring is wound up when the brush shaft is rotated to an off-normal position. The collar is slidably mounted to permit vertical movement of the shaft at the same time that the shaft is placed under rotary tension. Au

arm 32 pivoted at 33 and placed under tension by a spring 34. has its arc of rotation limited by the stops 35 and 36. This arm terminates in a hook 87 which engages a collar88 mounted on the brush shaft. A bell crank lever 39, pivoted at a0, and having one of its ends engaging the collar 38, serves as a latch member to hold the arm 32 in its elevated position. This latch member engages a-projection 1-1 on the arm 32. Another bell crank lever 42 is pivotally carried by the arm 32. This lever carries at one of its ends the tensioned elevating pawl 13, which is normally out of engagement with the vertical ratchet teeth 26 of the shaft. The vertical arinof lever 42 terminates in an angular member 44, which engages with the hooklike structure formed by the projections 45 of the bifurcated end of arm 12 when the shaft has been elevated one step.

'Having described the structure of the switch, its operation will be briefly given as follows:

WVhen the callin )artremoves his receiver from the switch hook, line relay 46 will be energized, which causes it to attract its armature. Slow relay 4-7 is thereupon actuated through a circuit which extends from grounded battery, front contact and armature of relay 16, relay a7 to ground. ,7 Relay 17 thereupon closes abreak point in the op-' erating circuit of magnet 11. At each 1mpulse from the calling dial, line relay 46 re tracts its armature and normally closes the" operating circuit of motor-magnet 11; T-his-* circuit extends from grounded battery, back. contact and armature of relay 46, motor-mag net 11, front contact and armature of slowreleasing relays? to ground.. Armature 10 I is actuated in response toeach of. these impulses and, through the agency of its rotary pawl 15, causes theshaft totake the .pre-

its armature 22 attracted during the first setracts its armature.

ries of impulses transmitted to the switch, which in this case are the rotary impulses. The armature 22, in being attracted, draws its pawl 25 downward until the pawl engages the first of the,vertical-ratchet teeth 26. Also, as soon as magnet 22is attracted, its link 28 releases theholding dog17, so that this holding member 1olcls the rotary ratchet in the position to which it has been advanced. -After theterminationof the first series of impulses, thejenergizing circuit of relay 46' remainsuninterrupted for a short interval of time. Relay. ,46,there'upon attracts its armature andmaintainslthe' slowreleasing magnet 17 energized. Theoperat- 'ing circuit of magnet-11 is interrupted for a relatively long period, during which time the contact springs-50,01 the energizingcircuit of magnet 21 are'held separated. This magnet is thereupon deenergized and re- This movement :causes the pawl 25 to elevate the brush shaft one Vertical step. The weight of the shaft is removed from the hook 37 of arm 32 and this permits the retractile spring 34: to elevate the arm 32 until it engages the stop .35. The

latch member 39 is also released by this the angular member 14C to engage the pro-. acct-101145 of the blfurcatedeendof arm 10.

In response to' the next series of directive impulses, the arm 10 which'is controlled by the armaturelO of motor-magnet 11,010- erates the vertical elevating pawl 13 through movement.

the agency of bell crank arm 42. During these impulses, the armature 22 of magnet 21 is held in retracted position since its energizing circuit is interrupted at the vertical normal springs 52. When the armature is retracted, the arm 57 engages a projection 61 on arm 32. This causes pawlf25 to engage the vertical ratchet teeth 26. Inthis position pawl 25 holds the shaft in any position to which it is elevated When the calling party replacesli1s receiver the relay 426 is deenergized. Tliisinteri'unts the circuit of relayt? at the front contact. and armature of relay L 6. Relay i'iretractsits armature and completes the ener izing circuit of magnet 21. Thiseircuit extends from grounded battery, magnet 21, conductors 51 "and 5 1, verticalofinormal springs 55, conductor 56,

armature and back contact47 to ground.

, Magnet 21 attracts its armature and draws down the holding pawl 25. In this movement the arm 57, which is attached to pawl 25, is freed fromprojection 61 which allows spring 27 to draw the holding pawl 25 out of en- 7 gagement with the vertlcal ratchet teeth on shaft 5. The shaft 5 under the influence of gravitydropsto its normal vertical position.

In so doing the rotary ratchet 9 becomes free from theelongated holding member 20 but is immediatelyengaged by.holding dog 17.

I W hen the shaft has returned to its vertical normal position, the energizing circuit, of

magnet 21 is broken at contact springs 55. Magnet 21 retracts its armature and thereb .tion determined *b'yhstop. pins 59 and 60.

It willbe understood that'the tooth 26 is providedwith a'notch'whichwill be in alinernent with-the pawl 25 when thejshaft 5*;is in its normalrotary position. This insures that the pawl 25 'willbegfree from the t0oth26,

lease of the-brush shaft.

Referr1ng .to.Fi-gs. 2 and 3 of; the drawif it-hase11gagecl this toothduring the reinc ings, there is shown a modification of the imprmed switch structure of the presentinvention.- In this modification after the.

brush shaft is rotated, nistead of being elevated towengage the desired contacts. it is lowered under the control of suitable escapement means untilthe desired group of contacts is engaged,

. Referring tonFig. 2, 101designates'a brush shaft mounted for rotary, and longitudinal This shaft carriesafbrush102 which engagesthecontacts 103 of switch 7 bank 104. The'up-per end of-t'he shaft is provided w tha holding tooth105, which 7 1. sengaged axsuita ble esc'apem'ent means" 10,6 carried-by the armaturef'of slow-releas- Ling magnet 107. A rotary ratchet 108 is carriedby'the brush shaft,fand it is engaged V j g by a tensioned rotary pawl 109, carried by and attracts its armature.

an extension of an L-shaped arm 110 of motor magnet 111. This arm, which carries armature 110 is pivoted at 112 and 1ts movement is limited in one direction by a stop member 113. The armature 110 car ries an insulated knob 138 which controls the circuit closing springs 126. An elongated rotary holding member 114 is pivotally mounted on rod 115 and. is actuated by a spring to normally engage the rotary ratchet. This holdingpawl is held out of engagement with the rotary ratchetby a latch member in the form of a bell-crank lever-116, pivoted at 117. One of th ends of this latch member engages a pro]ect1on on the holding pawl, and its other end bears 011 a collar 118, rigidly mounted .onthe brush shaft 101. A rotary spring 125 has one end secured to a casing 139, and its other end is attached to a collar provided with a projection which moves in a longitudinal slot 140 in shaft 101. This rotary spring provides for the return of the shaft t its normal rotary position, determined by stops 136 and 137. Vertical movement of the shaft is brought about by means of an escapement member 119 which engages vertical ratchet teeth 120 of the shaft. This escapement member is carried at one end of an arm 121, and is provided with a hook 130 for engagement with hook 131 of L-shaped arm 110. The arm 121 is pivoted at 122, and is provided near one of its ends with a hook 123 which engages collar 124. An insulated knob 141, carried by arm 121, controls circuit-closing springs 142 which are included in the operating circuit of slow releasing magnet 107. The lower end of the brush shaft is provided with a flat elongated bar 132 which is adapted to be engaged by the constantly revolving roller 133. This engagement takes place when the roller 134, carried by the armature of restoring magnet 135, forces the bar 132 against the revolving roller 133.

The operation of the switch is briefly as follows: The motor-magnet 111 is intermittently energized and deenergized in response to impulses from. the calling dial. This causes the armature of magnet 111 to drive the rotary ratchet through the prescribed number of steps and winds up the rotary spring 125. At the first attraction of armature 110, circuit-closing springs 126 are momentarily closed and the slow-releasing magnet 107 is energized over a circuit from grounded battery, circuit-closing springs 126, circuit contacts 142, slow-releasing mag net 107 to ground. Magnet 107 is energized This causes the tooth 105 on the brush shaft to escape from pallet 127 and to be supported by pallet 128. In this and the normal position of. the shaft, arm 121 is supported by hook 123 from collar 124. At the termination of the first series of impulses, however, the armature of relay 107 is retracted and the brush shaft is no longer supported by the escapement means 106. The shaft descends until arm 21 engages the stop 129, in which position the energizing circuit of slowsreleasing magnet 107 is broken at springs 142 and the shaft step by step.

It should be noted that the restoring magnet 135 is deenergized during the period intervening between the initiation of the call and its termination. When restoring magnet 135 is energized at the close of conversation, roller 134 carried by the armature of this magnet,'forces the bar 132 into engage ment with the constantly rotating roller 133 and elevates the shaft until'the pallet 127 of escapement means 106 engages and sup ports the brush shaft by tooth 105. When the brush shaft is restored to its normal vertical position, latch member 116 is actuated by collar 118 to throw the rotary pawl out of engagement with the rotary ratchet. The rotary spring 125 then restores the shaft to its normal rotary position, determined by stops 136 and 137.

It will be understood that the present in vention is capable of many variations and that it may be used in any field where selecting switches may be employed. The present disclosure is merely illustrative of the device and the scope of this invention will be limited only by the appended claims.

lVhat is claimed is:

1. In a selecting switch, passive contacts, active contacts mounted for engagement with said passive contacts through two series of movements, a single actuating means for operating said active contacts, and means including electromagnetic means responsive to the first impulse of a series of impulses and remaining actuated throughout the se ries for controlling these movements.

2. In a selecting switch, passive contacts, active contacts mounted for engagement with said passive contacts through two series of movements, a single electromagnetic means responsive to each impulse of a series for operating said active contacts, and means including electromagnetic means responsive to the first impulse of a series of impulses and remaining energized throughout the series for controlling these movements.

3. In a selecting switch, passive contacts, active contacts mounted for movement in two directions, a single actuating means for operating said active contacts, and means including electromagnetic means responsive to fig 1,283,831

the first impulse of a series of impulses and remaining actuated throughout the series forcontrolling the direction of the movement of 7 said last mentioned contacts.

l. In a selecting switch, passive contact-s, active contacts mounted to move-into 'en gagement with the desired passiveccontacts', a brush-carrying element mounted for rotary and vertical movement to which said. active contacts are secured, a slngle actuating means for operating the brush ca rrying element, and means includingca magnet responsive to the first impulse of a series of impulses and remaining aetuated throughout the series for controlling the proper se:

tacts secured to said shaft, a rotary pawl and a vertical aWl for oneratin said shaft Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patent-s,

an electromagnet, angular arm actuated by said electromagnet to successively operate said pawls, and a slow-releasing magnet which moves the shaft in a vertical direction tocontrol the sequence of operation.

'6. In a selecting switch, fixed-contacts, a

vertical shaft mounted for vertical and rof tary movement and PTOVlClGCtWlth vertical and rotary ratchet teeth, movable contacts carried by said shaft, an arm carryingmeans;

to move the shaft in a vertical direction, an electromagnet, an angular arm. provided with a rotary pawl, said angular arm being actuated by said electromagnet, and a slow- -releasing magnet .whose' armature operates at the close of the rotaryrsteps to bring the vertical moving means into engagement with said angular arm. In 'witness'whereof, I hereunto subscribe myJname this 31st day of July A. 11,1916.

ream: A. LUNDoUIsT.

, Washington, D. G. 

